Standard way to zoom in torwards mouse

[ThiagoBastosN]

Hello! I am currently using PhantomCamera for a 2D project.

I would like to know what is the recommended approach when it comes to zooming in the camera torwards the mouse cursor in two situations:

1. When the follow mode is set to None
2. When the follow mode is set to follow any target (glued or simple)

Currently I am using the setter set_zoom with a tween in order to make a smooth zooming effect and I zoom in/out with the mouse wheel.
I am using a variation of this logic to apply the correction on the camera to maintain the mouse cursor on the same position after the zoom takes effect:

func zoom(amount: Vector2) -> void:
	var mouse_pos = get_global_mouse_position()
	$Camera2D.zoom += amount
	var new_mouse_pos = get_global_mouse_position()
	$Camera2D.position += mouse_pos - new_mouse_pos

But I guess changing the PhantomCamera2D position directly when it is following a target is not the best approach. I had some trouble with it.

Is there a standard way to achieve the expected behavior when using PhantomCamera?

[ramokz]

But I guess changing the PhantomCamera2D position directly when it is following a target is not the best approach.

Correct, because the position is being set on every frame when a follow_mode and follow_target is set.

I have some ideas what you could try, but wondering if you could describe the use case / flow a bit further?
Is the camera meant to be stationary on the screen, and then when you scroll with the mouse wheel, the camera starts zooming in towards the position of the cursor?

[ThiagoBastosN]

Hey, @ramokz! Thanks for the fast reply. Yes, that's exactly it. I want the camera to remain stationary while "following" its main target, and when I use the mouse wheel, I want it to zoom toward the cursor position instead of just zooming toward the center of the screen.

In my case, the target will be a stationary image, so I'd still like to keep it as the camera's main target while allowing the zoom to focus on the cursor position.

[ramokz]

Attached a simple example; the only really “unique” thing used here compared to a standard Camera2D approach is the limit_target with an Area2D along with a CollisionShape2D applied that just restricts where the camera's viewport can be.
cursor_zoom_example.zip

Again, there's a fair few, very likely better, ways to achieve this effect depending on the feel you're looking for, but this is one approach.